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New to mac troubleshooting but not new to mac.
Yes i have followed all pre upgrade steps both here and other sites.
Everything was going fine and the MBP rebooted and continued till it gets to the 19 min remaining point and then i get the error,
"The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance."
Now i'm stuck in a loop. Not sure what to try now.

Do you have your original Snow Leopard install media? If you do, insert the Snow Leopard DVD, reboot and hold down the OPTION or C key as soon as you hear the chime. Once it boots to the Snow Leopard installer, go to the top menu "Utilities", "Disk Utility". Highlight your drive on the left side and then select erase. Choose Mac OS Journaled, name the drive, and press erase again.

After it erases the drive and formats it, you can continue to install Snow Leopard. Note that this procedure destroys all your data! So be sure to backup everything first before doing it.